Dualshock 4 support

when i decided to play my first primarily discord game, (realm royale and king of the hat are the only discord games i have, the rest are steam and twitch) it was mainly controller game, with keyboard support. i went to the settings to turn down the volume, but i coundn't exit the menu with the keyboard, so i tried the next best thing: i took a dualshock4 controller, switched steam to big picture, and conected the controller. i tried to press the button that would correspond to B on a Xbox controller, and it still didn't do anything. so, either there was something wrong with the game, or you guys might need to add support to Dualshock4 Controllers